Fix sky include guards to match Chromium style

sky/engine/core/dom/NodeRareData.h

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith <catfish.man@gmail.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
-#ifndef NodeRareData_h
-#define NodeRareData_h
+#ifndef SKY_ENGINE_CORE_DOM_NODERAREDATA_H_
+#define SKY_ENGINE_CORE_DOM_NODERAREDATA_H_
 
 #include "sky/engine/core/dom/Element.h"
 #include "sky/engine/core/dom/MutationObserverRegistration.h"
 #include "sky/engine/platform/heap/Handle.h"
 #include "sky/engine/wtf/HashSet.h"
 #include "sky/engine/wtf/OwnPtr.h"
 #include "sky/engine/wtf/PassOwnPtr.h"
 
 namespace blink {
 
@@ skipping 44 matching lines @@
 private:
     OwnPtr<NodeMutationObserverData> m_mutationObserverData;
 
     unsigned m_elementFlags : NumberOfElementFlags;
 protected:
     unsigned m_isElementRareData : 1;
 };
 
 } // namespace blink
 
-#endif // NodeRareData_h
+#endif  // SKY_ENGINE_CORE_DOM_NODERAREDATA_H_